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Finding the Fourth Proportional to 889.44, 1,225.76 and 640.34

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Solution

The fourth proportional to 889.44, 1,225.76 and 640.34 is: 882.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.44 : 1,225.76 = 640.34 : x
  2. Step 2: Convert to fraction form
    889.44/1,225.76 = 640.34/x
  3. Step 3: Cross multiply
    889.44x = 1,225.76 × 640.34
  4. Step 4: Simplify right side
    889.44x = 784,903.16
  5. Step 5: Solve for x
    x = 784,903.16/889.44
  6. Step 6: Final answer
    x = 882.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.